I need a WordPress website for my business with PayPal integration

General information for the website: We sell our own computer software
Kind of development: New website from scratch
Num. of web pages/modules: 6
Description of every page/module: I have some existing websites for my business which I would like to merge under one website domain.
www.gds.co.uk is to be the new parent - this is hosted on our own web server.
www.garagedatasystems.co.uk / www.cvmanager.co.uk / www.partsmanager.co.uk are the main content sites.

I wish to use WordPress so that my team can easily edit the content and do daily updates of News etc and keep the site fresh.

I would like the new WordPress site to take the content from all existing websites. The look and feel of the new site can be brand new, but hopefully we can use a lot of the content on the existing sites, and add new content where required.
Description of requirements/features: I would like the new WordPress site designing and creating to take the content from all existing websites. The look and feel of the new site can be brand new, but hopefully we can use a lot of the content on the existing sites, and add new content where required.

I would like a PayPal page to allow customers to purchase from us, passing their 6 character Customer Ref for our records, and picking from a list of items which have prices set.
Extra services needed: Installation, 3rd party integration
Specific technologies required: WordPress, PayPal
Extra notes: